rqt_plot:包装相同对象类的PyQt4和PyQt5

Question

我正在尝试使用ROS的rqt_plot特性，每次我调用rqt_plot时都会得到：

Traceback (most recent call last):
  File "/opt/ros/kinetic/bin/rqt_plot", line 6, in <module>
    from rqt_plot.plot import Plot
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rqt_plot/plot.py", line 43, in <module>
    from .data_plot import DataPlot
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rqt_plot/data_plot/__init__.py", line 44, in <module>
    from .pyqtgraph_data_plot import PyQtGraphDataPlot
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rqt_plot/data_plot/pyqtgraph_data_plot.py", line 46, in <module>
    from pyqtgraph import __version__ as pyqtgraph_version
  File "/usr/lib/python2.7/dist-packages/pyqtgraph/__init__.py", line 13, in <module>
    from .Qt import QtGui
  File "/usr/lib/python2.7/dist-packages/pyqtgraph/Qt.py", line 104, in <module>
    from PyQt4 import QtGui, QtCore, uic
RuntimeError: the PyQt4.QtCore and PyQt5.QtCore modules both wrap the QObject class

我见过其他人通过卸载Qt4而只使用Qt5来修复这个问题，但我不完全确定为什么对我来说会存在这个问题，因为我甚至不相信我已经安装了qt4。

调用pip3 uninstall pyqt4返回：

Cannot uninstall requirement pyqt4, not installed

我如何强制rqt_plot使用qt5，或者我还应该做什么？

这是ROS kinetic和ubuntu 16.04 LTS。

Answer 1

您可能已经安装了Qt4，为了确保检查，可以从命令行打开python并运行：

from PyQt4.QtCore import QT_VERSION_STR
print(QT_VERSION_STR)

同样，您可以通过将4替换为5来检查Qt5。但是，您需要先退出并重新启动python。